How broken is the in game economy?

On a tangent, I have a couple questions about the "event campaign" system which is new to me since I came back from a break.

First, how long does the cycle to complete an event campaign and get the reward take? Is this something you finish once a year if you all available events? Or more often?

Second, with the available options of a Premium Choice Box, 1,500 Lobi, or 2x T6 1005 Discount Coupons, are there any ships in the game that are not attainable through the event system and only can be had from a lock box or buying off the exchange? (Leaving aside the past Summer / Winter event ships you can get from the Phoenix Box.)

Just curious at this point whether the new system actually covers everything that used to be lockbox / exchange only, or if there still are premium ships that can't be had except from grinding credits or opening lockboxes.

/r/sto Thread